[ovirt-users] Q: VM disk speed penalty NFS vs Local data center storage

Yaniv Kaul ykaul at redhat.com
Mon Feb 26 11:49:31 UTC 2018

On Mon, Feb 26, 2018 at 1:30 PM, Andrei Verovski <andreil1 at starlett.lv>

> Hi,
> Since oVirt doesn’t support more then 1 host in data center with local
> storage domain as described here:
> http://lists.ovirt.org/pipermail/users/2018-January/086118.html
> I have to setup NFS server on node with VMs (on same node) access via NFS.
> 10 GB shared storage is in the future plans yet right now have only 2
> nodes with local RAID on each.
> Q: What is VM disk speed penalty (approx %)  NFS vs Local RAID in oVirt
> data center storage?
> Currently I have 2 VMs running our accounting/inventory control system
> which are critical to storage performance limits.
> 2 other VMs have very low disk activity.

I don't know, but please remember there's both latency and throughput, both
of which are somewhat affected. Throughput will benefit from jumbo frames,
for example. Unfortunately it may affect latency a bit.
There was an interesting patch that if the NFS was local, bypassed the
NFS[1]. It was never completed and merged.
Lastly, chapter 6 at hyper-converged guide (should be available in few
hours) might be an interesting idea for you to consider - a single Gluster
that can later expand.

[1] https://gerrit.ovirt.org/#/c/68822/

> Thanks in advance
> Andrei Verovski
> _______________________________________________
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> Users at ovirt.org
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